Intersecting Roof Valleys

Stop nailing 6 inches from the center.

Intersecting roof valleys. Interestingly you can mix and match roof styles when building a gable and valley roof designs for a cross footprint home. It s also known as a cross gable roof since the home has a cross footprint. Gable and valley roof. The gable and valley roof is a very popular roof design.

The gable roof on the porch addition was framed with a dropped structural ridge supporting the common rafters above. Intersecting roofs using a closed valley must have the same slopes so that the shingle butts line up at the valley intersection. Repeat the process on the other side of the hip using the pitch of the hip for the secondary roof 9 5 8 18 13 16. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap.

Roof one side of the valley running the shingles across it. For roof pitches less then 6 per foot the flashing extends at least 12. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. For roof pitches of 6 or more per foot the flashing extends at least 9 under the roof covering on each side.

Again choosing the easy way out we opted to build blind valleys aka california valleys where one intersecting roof is built on top of the other. An unequally pitched valley rafter is laid out in the same way as the unequally pitched hip. How to install a valley on a vicwest metal roof. Where two gable roof lines meet the intersection forms inside corners called valleys.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Applicable for ultravic supervic 7 8 corrugated barnmaster diamond rib double. The main difference between the two is that valley rafters sit on inside corners while hip rafters sit on the outside corners.